/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* eggtrayicon.c
 * Copyright (C) 2002 Anders Carlsson <andersca@gnu.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#include "config.h"
#include <string.h>
#include <libintl.h>

#include "eggtrayicon.h"

#include <gdkconfig.h>
#if defined (GDK_WINDOWING_X11)
  #include <gdk/gdkx.h>
  #include <X11/Xatom.h>
#elif defined (GDK_WINDOWING_WIN32)
  #include <gdk/gdkwin32.h>
#endif

#ifndef EGG_COMPILATION
  #ifndef _
    #define _(x) dgettext (GETTEXT_PACKAGE, x)
    #define N_(x) x
  #endif
#else
  #define _(x) x
  #define N_(x) x
#endif

#define SYSTEM_TRAY_REQUEST_DOCK    0
#define SYSTEM_TRAY_BEGIN_MESSAGE   1
#define SYSTEM_TRAY_CANCEL_MESSAGE  2

#define SYSTEM_TRAY_ORIENTATION_HORZ 0
#define SYSTEM_TRAY_ORIENTATION_VERT 1

enum
{
  PROP_0,
  PROP_ORIENTATION
};

static GtkPlugClass *parent_class = NULL;

static void egg_tray_icon_init (EggTrayIcon *icon);
static void egg_tray_icon_class_init (EggTrayIconClass *klass);

static void egg_tray_icon_get_property (GObject    *object,
                                        guint       prop_id,
                                        GValue     *value,
                                        GParamSpec *pspec);

static void egg_tray_icon_realize   (GtkWidget *widget);
static void egg_tray_icon_unrealize (GtkWidget *widget);

#ifdef GDK_WINDOWING_X11
static void egg_tray_icon_update_manager_window    (EggTrayIcon *icon,
                                                    gboolean     dock_if_realized);
static void egg_tray_icon_manager_window_destroyed (EggTrayIcon *icon);
#endif

GType
egg_tray_icon_get_type (void)
{
  static GType our_type = 0;

  if (our_type == 0)
  {
    static const GTypeInfo our_info =
    {
      sizeof (EggTrayIconClass),
      (GBaseInitFunc) NULL,
      (GBaseFinalizeFunc) NULL,
      (GClassInitFunc) egg_tray_icon_class_init,
      NULL, /* class_finalize */
      NULL, /* class_data */
      sizeof (EggTrayIcon),
      0,    /* n_preallocs */
      (GInstanceInitFunc) egg_tray_icon_init
    };

    our_type = g_type_register_static (GTK_TYPE_PLUG, "EggTrayIcon", &our_info, 0);
  }

  return our_type;
}

static void
egg_tray_icon_init (EggTrayIcon *icon)
{
  icon->stamp = 1;
  icon->orientation = GTK_ORIENTATION_HORIZONTAL;

  gtk_widget_add_events (GTK_WIDGET (icon), GDK_PROPERTY_CHANGE_MASK);
}

static void
egg_tray_icon_class_init (EggTrayIconClass *klass)
{
  GObjectClass *gobject_class = (GObjectClass *)klass;
  GtkWidgetClass *widget_class = (GtkWidgetClass *)klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->get_property = egg_tray_icon_get_property;

  widget_class->realize   = egg_tray_icon_realize;
  widget_class->unrealize = egg_tray_icon_unrealize;

  g_object_class_install_property (gobject_class,
                                   PROP_ORIENTATION,
                                   g_param_spec_enum ("orientation",
                                                      _("Orientation"),
                                                      _("The orientation of the tray."),
                                                      GTK_TYPE_ORIENTATION,
                                                      GTK_ORIENTATION_HORIZONTAL,
                                                      G_PARAM_READABLE));

#if defined (GDK_WINDOWING_X11)
  /* Nothing */
#elif defined (GDK_WINDOWING_WIN32)
  g_warning ("Port eggtrayicon to Win32");
#else
  g_warning ("Port eggtrayicon to this GTK+ backend");
#endif
}

static void
egg_tray_icon_get_property (GObject    *object,
                            guint       prop_id,
                            GValue     *value,
                            GParamSpec *pspec)
{
  EggTrayIcon *icon = EGG_TRAY_ICON (object);

  switch (prop_id)
  {
    case PROP_ORIENTATION:
      g_value_set_enum (value, icon->orientation);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

#ifdef GDK_WINDOWING_X11

static void
egg_tray_icon_get_orientation_property (EggTrayIcon *icon)
{
  Display *xdisplay;
  Atom type;
  int format;
  union
  {
    gulong *prop;
    guchar *prop_ch;
  } prop = { NULL};
  gulong nitems;
  gulong bytes_after;
  int error, result;

  g_assert (icon->manager_window != None);

  xdisplay = GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (GTK_WIDGET (icon)));

  gdk_error_trap_push ();
  type = None;
  result = XGetWindowProperty (xdisplay,
                               icon->manager_window,
                               icon->orientation_atom,
                               0, G_MAXLONG, FALSE,
                               XA_CARDINAL,
                               &type, &format, &nitems,
                               &bytes_after, &(prop.prop_ch));
  error = gdk_error_trap_pop ();

  if (error || result != Success)
    return;

  if (type == XA_CARDINAL)
  {
    GtkOrientation orientation;

    orientation = (prop.prop [0] == SYSTEM_TRAY_ORIENTATION_HORZ) ?
                  GTK_ORIENTATION_HORIZONTAL :
                  GTK_ORIENTATION_VERTICAL;

    if (icon->orientation != orientation)
    {
      icon->orientation = orientation;

      g_object_notify (G_OBJECT (icon), "orientation");
    }
  }

  if (prop.prop)
    XFree (prop.prop);
}

static GdkFilterReturn
egg_tray_icon_manager_filter (GdkXEvent *xevent, GdkEvent *event, gpointer user_data)
{
  EggTrayIcon *icon = user_data;
  XEvent *xev = (XEvent *)xevent;

  if (xev->xany.type == ClientMessage &&
      xev->xclient.message_type == icon->manager_atom &&
      xev->xclient.data.l[1] == icon->selection_atom)
  {
    egg_tray_icon_update_manager_window (icon, TRUE);
  }
  else if (xev->xany.window == icon->manager_window)
  {
    if (xev->xany.type == PropertyNotify &&
        xev->xproperty.atom == icon->orientation_atom)
    {
      egg_tray_icon_get_orientation_property (icon);
    }
    if (xev->xany.type == DestroyNotify)
    {
      egg_tray_icon_manager_window_destroyed (icon);
    }
  }
  return GDK_FILTER_CONTINUE;
}

#endif  

static void
egg_tray_icon_unrealize (GtkWidget *widget)
{
#ifdef GDK_WINDOWING_X11
  EggTrayIcon *icon = EGG_TRAY_ICON (widget);
  GdkWindow *root_window;

  if (icon->manager_window != None)
  {
    GdkWindow *gdkwin;

    gdkwin = gdk_window_lookup_for_display (gtk_widget_get_display (widget),
                                            icon->manager_window);

    gdk_window_remove_filter (gdkwin, egg_tray_icon_manager_filter, icon);
  }

  root_window = gdk_screen_get_root_window (gtk_widget_get_screen (widget));

  gdk_window_remove_filter (root_window, egg_tray_icon_manager_filter, icon);

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
#endif
}

#ifdef GDK_WINDOWING_X11

static void
egg_tray_icon_send_manager_message (EggTrayIcon *icon,
                                    long         message,
                                    Window       window,
                                    long         data1,
                                    long         data2,
                                    long         data3)
{
  XClientMessageEvent ev;
  Display *display;

  ev.type = ClientMessage;
  ev.window = window;
  ev.message_type = icon->system_tray_opcode_atom;
  ev.format = 32;
  ev.data.l[0] = gdk_x11_get_server_time (GTK_WIDGET (icon)->window);
  ev.data.l[1] = message;
  ev.data.l[2] = data1;
  ev.data.l[3] = data2;
  ev.data.l[4] = data3;

  display = GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (GTK_WIDGET (icon)));

  gdk_error_trap_push ();
  XSendEvent (display,
              icon->manager_window, False, NoEventMask, (XEvent *)&ev);
  XSync (display, False);
  gdk_error_trap_pop ();
}

static void
egg_tray_icon_send_dock_request (EggTrayIcon *icon)
{
  egg_tray_icon_send_manager_message (icon,
                                      SYSTEM_TRAY_REQUEST_DOCK,
                                      icon->manager_window,
                                      gtk_plug_get_id (GTK_PLUG (icon)),
                                      0, 0);
}

static void
egg_tray_icon_update_manager_window (EggTrayIcon *icon,
                                     gboolean     dock_if_realized)
{
  Display *xdisplay;

  if (icon->manager_window != None)
    return;

  xdisplay = GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (GTK_WIDGET (icon)));

  XGrabServer (xdisplay);

  icon->manager_window = XGetSelectionOwner (xdisplay,
                                             icon->selection_atom);

  if (icon->manager_window != None)
    XSelectInput (xdisplay,
                  icon->manager_window, StructureNotifyMask|PropertyChangeMask);

  XUngrabServer (xdisplay);
  XFlush (xdisplay);

  if (icon->manager_window != None)
  {
    GdkWindow *gdkwin;

    gdkwin = gdk_window_lookup_for_display (gtk_widget_get_display (GTK_WIDGET (icon)),
                                            icon->manager_window);

    gdk_window_add_filter (gdkwin, egg_tray_icon_manager_filter, icon);

    if (dock_if_realized && GTK_WIDGET_REALIZED (icon))
      egg_tray_icon_send_dock_request (icon);

    egg_tray_icon_get_orientation_property (icon);
  }
}

static void
egg_tray_icon_manager_window_destroyed (EggTrayIcon *icon)
{
  GdkWindow *gdkwin;

  g_return_if_fail (icon->manager_window != None);

  gdkwin = gdk_window_lookup_for_display (gtk_widget_get_display (GTK_WIDGET (icon)),
                                          icon->manager_window);

  gdk_window_remove_filter (gdkwin, egg_tray_icon_manager_filter, icon);

  icon->manager_window = None;

  egg_tray_icon_update_manager_window (icon, TRUE);
}

#endif

static void
egg_tray_icon_realize (GtkWidget *widget)
{
#ifdef GDK_WINDOWING_X11
  EggTrayIcon *icon = EGG_TRAY_ICON (widget);
  GdkScreen *screen;
  GdkDisplay *display;
  Display *xdisplay;
  char buffer[256];
  GdkWindow *root_window;

  if (GTK_WIDGET_CLASS (parent_class)->realize)
    GTK_WIDGET_CLASS (parent_class)->realize (widget);

  screen = gtk_widget_get_screen (widget);
  display = gdk_screen_get_display (screen);
  xdisplay = gdk_x11_display_get_xdisplay (display);

  /* Now see if there's a manager window around */
  g_snprintf (buffer, sizeof (buffer),
              "_NET_SYSTEM_TRAY_S%d",
              gdk_screen_get_number (screen));

  icon->selection_atom = XInternAtom (xdisplay, buffer, False);

  icon->manager_atom = XInternAtom (xdisplay, "MANAGER", False);

  icon->system_tray_opcode_atom = XInternAtom (xdisplay,
                                               "_NET_SYSTEM_TRAY_OPCODE",
                                               False);

  icon->orientation_atom = XInternAtom (xdisplay,
                                        "_NET_SYSTEM_TRAY_ORIENTATION",
                                        False);

  egg_tray_icon_update_manager_window (icon, FALSE);
  egg_tray_icon_send_dock_request (icon);

  root_window = gdk_screen_get_root_window (screen);

  /* Add a root window filter so that we get changes on MANAGER */
  gdk_window_add_filter (root_window,
                         egg_tray_icon_manager_filter, icon);
#endif
}

EggTrayIcon *
egg_tray_icon_new_for_screen (GdkScreen *screen, const char *name)
{
  g_return_val_if_fail (GDK_IS_SCREEN (screen), NULL);

  return g_object_new (EGG_TYPE_TRAY_ICON, "screen", screen, "title", name, NULL);
}

EggTrayIcon*
egg_tray_icon_new (const gchar *name)
{
  return g_object_new (EGG_TYPE_TRAY_ICON, "title", name, NULL);
}

guint
egg_tray_icon_send_message (EggTrayIcon *icon,
                            gint         timeout,
                            const gchar *message,
                            gint         len)
{
  guint stamp;

  g_return_val_if_fail (EGG_IS_TRAY_ICON (icon), 0);
  g_return_val_if_fail (timeout >= 0, 0);
  g_return_val_if_fail (message != NULL, 0);

#ifdef GDK_WINDOWING_X11
  if (icon->manager_window == None)
    return 0;
#endif

  if (len < 0)
    len = strlen (message);

  stamp = icon->stamp++;

#ifdef GDK_WINDOWING_X11
  /* Get ready to send the message */
  egg_tray_icon_send_manager_message (icon, SYSTEM_TRAY_BEGIN_MESSAGE,
                                      (Window)gtk_plug_get_id (GTK_PLUG (icon)),
                                      timeout, len, stamp);

  /* Now to send the actual message */
  gdk_error_trap_push ();
  while (len > 0)
  {
    XClientMessageEvent ev;
    Display *xdisplay;

    xdisplay = GDK_DISPLAY_XDISPLAY (gtk_widget_get_display (GTK_WIDGET (icon)));

    ev.type = ClientMessage;
    ev.window = (Window)gtk_plug_get_id (GTK_PLUG (icon));
    ev.format = 8;
    ev.message_type = XInternAtom (xdisplay,
                                   "_NET_SYSTEM_TRAY_MESSAGE_DATA", False);
    if (len > 20)
    {
      memcpy (&ev.data, message, 20);
      len -= 20;
      message += 20;
    }
    else
    {
      memcpy (&ev.data, message, len);
      len = 0;
    }

    XSendEvent (xdisplay,
                icon->manager_window, False, StructureNotifyMask, (XEvent *)&ev);
    XSync (xdisplay, False);
  }
  gdk_error_trap_pop ();
#endif

  return stamp;
}

void
egg_tray_icon_cancel_message (EggTrayIcon *icon,
                              guint        id)
{
  g_return_if_fail (EGG_IS_TRAY_ICON (icon));
  g_return_if_fail (id > 0);
#ifdef GDK_WINDOWING_X11  
  egg_tray_icon_send_manager_message (icon, SYSTEM_TRAY_CANCEL_MESSAGE,
                                      (Window)gtk_plug_get_id (GTK_PLUG (icon)),
                                      id, 0, 0);
#endif
}

GtkOrientation
egg_tray_icon_get_orientation (EggTrayIcon *icon)
{
  g_return_val_if_fail (EGG_IS_TRAY_ICON (icon), GTK_ORIENTATION_HORIZONTAL);

  return icon->orientation;
}
